Water-tube boiler with superheater



May 18 1926.

B. BROIDO WATER TUBE BOILER WITH SUPERHEATER fl 2? 2. Sheets-Sheet Filed Oct 4.

7 A TTORNEY.

May 18 1926. 1,585,230

. B. BROIDO WATER TUBE BOILER WITH SUPERHEATER Filed Oct. 4, 1922 2 Sheets-Sheet 2 @QQ @QC) EMMA/WIN BRO/.00

INVENTOR.

' ATTORNEY.

Patented May '18, 1926.

' UNITED STATES 1,585,230 PATENT OFFICE.

BENJAMIN BEOIDO, OF NEW YORK, N. .Y., ASSIGNOB TO THE SUPERHEATER COMPANY.

OF NEW YORK, N. Y.

WATER-TUBE BOILER WITH SUPERHEATEB.

Application filed October 4, 1922. Serial No. 592,295.

My invention relates particularly to water tube boilers of the type wherein the tubes are rolled into upper and lower drums, the tubes being usually somewhat inclined away 6 from the vertical. While in some boilers of this general type provision has been made to withdrawtubes, which are to be removed, through one of the drums, the more usual arrangement is to take the tube directly out of its bank without passing it through the drums. For the first row of tubes in a bank this is evidently possible .no matter how closely spaced the tubes are in the row; but to remove a tube from a row behind the first without disturbing any of the tubes in the rows in front of it, some special spacing must be adopted. Lanes or alleys must be left from front to back of the bank, wide enough for the tubes to pass. It is unnecessary to leave a wide lane between all the tubes: if alternate lanes are made wide then evidently each tube will be adjacent to a wide lane. 7 This arrangement is standard, but a serious disadvantage has long been recognized, which is that the gases from the furnace are given too free a path to the stack, so that not enough of their heat is absorbed by the tubes. From this point of view a staggered arrangement of the tubes is high y desirable, but it has so far not been'feasible to work out a satisfactory staggered arrangement which will still admit of easy removal of tubes.

My invention provides an improved combination of boiler tubes and superheater elements whereby substantially all the advantages of the staggered arrangement are realized and the ready removal of boiler tubes is not materially interfered with.

ing rawings, wherein Fig. 1 is a transverse sectional view of a boiler with my invention, and Fig; 2 is an enlarged sectional view on line 22 of Fig. 1.

The boiler in connection with which I illustrate my invention is of a usual type and is not modified for my purpose. Upper drums 1, 1 are connected to lower drums 2 and 2 by the banks of tubes 3", 3". Drums 2 and 2 are farther apart than 1 and 1" so that the water tubes are. inclined. Baffiing 4 4" directs the gases from the furnace 5 on their way to the stack connections 6, 6". The whole is enclosed in the housing 7.

straight lengths of the elements. These are M invention is shown in the accompany- The view of Fig. 2 is taken looking in the direction indicated by the arrows in Fig. 1, so that the tubes at the bottom of Fig. 2 are the ones nearest to the furnace. It will be observed that the alternate lanes 8, 8 are wider than the intervening ones 9, 9. The tubes not being staggered, these lanes all extend in the direction of gas travel, and the gases are not forced into intimate contact with the tubes.

Referring now again to Fig. 1, attention is called to the location of the superheater. The headers of this apparatus are shown at 10. 11, 11 are the tubular elements or units, the ends. of which are secured to the headers in. the well-known, readily detachable'manner. The superheater itself is of a well-known form and calls for no description, except for the disposition of the generally parallel to the water tubes and extend throughout the greater length of the water tubes.

Looking at the cross-section of Fig. 2, the straight lengths of the superheater elements are seen to be so arranged relatively to the water tubes that the effect is closely the same as if the water tubes were staggered. Thereby the gases are forced into more intimate contact with the water tubes, as well as into intimate contact with the superheater elements also. I I

The passage of the gases is especially free, as above mentioned, through the wide lanes 8, 8 and it is a part of my invention to equalize this by placing more loops of superheater elements into them than into the narrower lanes. The additional resistance to the gas flow causes an additional portion of the gases tov pass through the narrower lanes. Thus there are shown four complete loops, or" eight straight.

lengths, of superheater tubes shown in the quick operation, requiring only the taking of and replacing of two or at most four nuts, as is well understood by those versed in this art. The particular quiek ly detachable means for securing the units to the headers not being part of this invention but being well-known, need not be here described. One form is well shown and described in United States Patent No. 1,328,36l granted to the present inventor on January 20th, 19:20. 1 Other forms, involving somewhat dilfcrent forms of headers may obviously be used if preferred.

hat I claim is:

1.. In a boiler of the class described having water tubes alined in the direction of gas travel, the rows of water tubes being spaced throughout so as to present unobstructed lanes of travel for the gases from the furnace, the combination with said water tubes of superheater elements comprising straight lengths of tubing, said lengths being placed in he lanes normally oceurring between said rows and parallel to the water tubes whereby the gases are forced to follow a tortuous path.

2. In a boiler of the class described having water tubes which are arranged in transverse rows and are alined in the direction of gas travel so that each tube lies directly behind one of the transverse row immediately in front of it, whereby there are left unobstructed lanes of travel for the gases, the combination with said water tubes of serpentine tubular superheater elements comprising straight lengths of tubing, said straight lengths of any one element lying in a lane and parallel to the water tubes.

3. In a boiler of the class described having water tubes alined in the direction of gas travel, the rows of water tubes being spaced so as to present unobstructed lanes of travel for the gases from the furnace, alternate lanes being wider, the combination with said water tubes of superheater elements comprising straight lengths of tubing said lengths being placed in the lanes parallel to thewater tubes, there being more such lengths in the wider lanes, whereby the resistance to gas flow through all the lanes is substantially equalized.

t. In a boiler of the class described, having an upper and a lower drum and tubes connecting them, said tubes being arranged in transverse rows and so alincd in the direction of gas travel that each tube lies directly behind one of the transverse row immediately in front of it, whereby there are left unobstructed lanes of travel for the gases; the combination with said tubes and drums of a plurality of superheater elements, and superheater headers located in proximity to the upper drum to which headers the superheater elements are detaehably secured, said elements comprising st *aight lengths of tubing located between said rows of water tubes and parallel and staggered relatively to the water tubes.

5. In a boiler of the class described having water tubes alined in the direction of gas travel, the rows of water tubes being spaced throughout so as to present unob structed lanes of travel for the gases from the furnace, the combination with the water tubes of superheater elements comprising straight lengths of tubing, said lengths being placed in the lanes normally occurring between said rows of water tubes and paralllpl and staggered relatively to the water tu es.

BENJAMIN BROIDO. 

